Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 8,302	$ 21,152	$ 38,731	$ 64,961
Changes in unrealized gains/losses on AFS securities, net of taxes of $3,475, $10,043, $(6,151), and $34,710	(10,765)	(31,117)	19,062	(107,544)
Changes in unrealized gains/losses on cash flow hedges, net of taxes of $(872), $(1,646), $43, and $(7,076)	2,702	5,099	(135)	21,924
Comprehensive income (loss)	$ 239	$ (4,866)	$ 57,658	$ (20,659)